Spark plug



March l0, 1925.

J. REICH SPARK PLUG jlb-vchoz Joseph Reich.

Patented Mar.` 10, 1925. l

PATENT OFFICE.

JOSEPH REICH, F BERKELEY, CALIFORNIA.

SPARK PLUG.

Application and August s, 1921. seria; no. 49o,`541.

To all whom z't 'may concern:

Be it l known that I, JOSEPH REIeH, a British subject, residing at Berkeley, 1n the county ot'l Alameda and State of California,.

have invented certain new and useful Improvements in Spark Plugs, of which the following is a specification.-

My` invention is an improved spark plug constructed with improved means for cleaning its electrodes. l

Referring to the annexed drawing in whichmy invention is illustrated and which forms apartof this specification:

Figure 1 is a plug.

Figure 2 is a longitudinal section of my spark plug.

F'gure 3- is an inner end view of my spark plug.

ing having an external threadl 2 which screws in the head of the engine cylinder and a wrench receiving surface formed on its upper end for securing the plug into the cylinder. The upper portion of said "easing is larger in diameter than the lower portion providing an internal shoulder 4. A

plug 5 of insulation fits in the casing through the upper end` of the casing, said plug be 'o ling formed with an annular external shoul- .fle-r 6 which rests upon the casing 'shoulder V4. The casing 1 'has' an internal thread 7 in its upper end in which screws a sleeve nut- 8 which surrounds the plug 5 and engages the plug shoulder 6 and holds the plug in the casing with the plug shoulder 6 againstthe casing shoulder 4. The inner end of the casing 1 forms the ground electrode 9 which is ormed at its extremity with four ground points 10. The points 10 are spaced circumferentially and diametrically-and each point convexlfges inwardly to edges 11 from the upper end of which edges the*l inner surfaces 12 ofk the points which are opposite each other diverge upwardly. The plug 5 has :1 central longitudinal bore 13 through which extends a metal sleevel't on the inner end of which is an annular Hang/s 15 which engages the lower -end of 0 the 1' plug, the upper end portion of said `sleeve lhaving an external thread 16 to reside elevation of my spark In the 7drawing 1 indicates the plugl cas-V of the plug. The sleeve 14 has a conical seat' 18 in its lower end. An electrode rod 19 extends through the sleeve 14. A conical electrode 2O screws on the lower end of the rod 19 below the plug 5 within the lower end of the casing 1. A conical closure 21 is provided on the lower part of the rod`19 a short distance above the electrode 20." "A handle 22 is screwed on a thread 23 on the upper portion of the rod 19 anda lock nut 24 screws on said thread against the upper side of the handle. A spring 25 surrounds said rod between the upper end of the sleeve 14 and the under side of the handle 22 and lholds the rod in its uppermost position with the closure 21 upon its seat 18 and the electrode 2O slightly above the diverging electrode surfaces 12. The closure 21 when leased the spring 23 returns the rod 19 and electrode on the lower en'd of said casing.

said electrode having a plurality of triangular spark gap tcrmlnal Imembers arranged c1rcumferent1ally. the said faces of said ter- 20 and closure 21 to their norniinal members converging inwardly and i meeting 1n upwardly divergmg lines, an 1nsulating plug mounted in said casing, a

sleeve extending through said plug, a rod extending through said sleeve, and electrode in the form of the frustum of' a cone sccured on the lower end of vsaid rod and being positioned adjacent to said lines, a han-- dle'on the upper end ofsaid rod, a spring surrounding said rod between the upper end 'of said sleeve and said handle for normally gage and clean said terminal members.

In testimony whereof2 I atlix my signature.

JOSEPH REICH'. 

